Because the upgrade process has changed, the manual step have changed a
bit too.

This will allow the convert plan to be used to update trusted
certificate extensions without enforcing node group changes. Such a
capability is useful for upgrading from 2018.1 to 2019.7

Puppet 5, doesn't have the `puppet ssl` command.

New style compilers don't have a peadm_role cert extension anymore; they
only have a pp_auth_role.

So that compilers classify successfully and can run Puppet

When using the orchestrator transport there is a problem with the
built-in service task when the orchestrator is upgraded but the
pxp-agents are not. Switching to run_command and `systemctl stop` during
this time avoids the problem.

Otherwise, the certs potentially can't be signed due to having
authorization extensions.

This commit updates the configuration file to point to the official Puppet VS Code Extension `puppet.puppet-vscode`

(maint) Update Puppet VS Code Extension ID

If it was stopped before, it should still be stopped after.

We now use this plan at a time when the master is 2019.x but agents
could be 2018.x. So, make it compatible.

Otherwise it seems there's a chance it'll re-create files we need to be
absent.

use platform-python on RHEL8

Upgrade from 2018

Tested upgrade from 2019.7 locally with success.

Update validate_version.pp

So that users who keep token files in a non-standard location can still
run the upgrade plan (starting with 2019.8 and newer)

If a PG node has the wrong entry for puppet_master_host or
database_host, then running puppet-enterprise-installer won't upgrade
PostgreSQL as needed. The pe.conf on PG nodes is effectively inert most
of the time, so if it gets out of date there's nothing to fix it.

This optional util plan will ensure the pe.conf has the minimum required
correct values.

This util plan may be integrated into the upgrade plan at a later date.

Missing path argument

This will be the last manual CHANGELOG file, per
https://confluence.puppetlabs.com/display/ECO/Self-Service+Module+Release+Process